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One great way to display data is to use a circle graph.
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Let's say we polled a group of kids on
their favorite amusement park rides. The choices included:
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Roller coaster
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Ferris wheel
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Water rides
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Bumper cars
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After the survey the percentages were
as follows:
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Roller coaster: 33%
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Ferris wheel: 12%
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Water rides: 39%
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Bumper cars: 16%
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 To
make a circle graph using this information we must figure out what
portion of the circle graph should include each ride. We'll do
this by solving
proportions. Remember that all circles are 360° and all
percents are out of 100%.
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Roller Coaster:
100x = 11880
x = 118.8
We'll round this to 119°. |
Ferris Wheel:
100x = 4320
x = 43.2
We'll round this to 43°.
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Water Rides:
100x = 14040
x = 140.4
We'll round this to
140°. |
Bumper Cars:
100x = 5760
x = 57.6
We'll round this to 58°.
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Now, by using a protractor we can
divide the circle graph into four pieces using the degree measures that
we calculated.
Let's practice making circle graphs.
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